Michael L Elder

US Patent:

6810120, Oct 26, 2004

Filed:

May 15, 2000

Appl. No.:

09/570617

Inventors:

Michael J. Elder - Wheaton IL
Joseph J. Kott - Aurora IL
Raymond L. Ruggerio - Glenview IL
Jane A. Thompson - Batavia IL
Robin J. Thompson - Batavia IL
Kimberly S. Tomasko-Dean - LaGrange IL

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

H04M 100

US Classification:

379377, 379350

Abstract:

Audible ring, which is provided to all line appearances, is detected and used to determine whether or not a far end party has answered, i. e. , answer supervision, for equipment connected to the line appearance which requires answer supervision for proper operation. The line appearance is monitored to detect ringing tone received at the line appearance within a first period of time from call origination. If ringing tone is not detected at the line appearance within the first period of time, receipt of answer supervision is indicated. If ringing tone is detected at the line appearance within the first period of time, the timing for the first period of time is canceled and timing for a second period of time is started from the cancellation of timing for the first time period. The timing for the second period of time is restarted each time ringing tone is detected at the line appearance during the second period of time with receipt of answer supervision being indicated if ringing tone is not detected within the second period of time.